1. insect proof: after the vegetable covers the insect resistant net, it can basically be exempt from the pests such as the cabbage worm, the Plutella xylostella, the cabbage moth, the Spodoptera litura, the beetle, the aphid and the aphids. According to the experiment, the pest control net has a control effect of 94--97% on cabbage cabbage, Plutella xylostella, cowpea borer and l.americana, and its control effect on aphids is 90%.

2. prevention: viral diseases are disastrous diseases on many vegetables, mainly insects, especially aphids.

Get sick. As the pest control network cuts off the main way of transmitting pests, the infection of vegetable viruses is greatly reduced, and the control effect is about 80%.

3. adjust the temperature, soil temperature and humidity: the test showed that in the hot 7-8 months, the temperature in the morning and evening was flat in the 25 mesh white insect proof net, and the day in the sunny day was about 1 lower than that in the open area. In the early spring 3-4 months, the temperature in the greenhouse covered with insect nets was 1-2 degrees higher than that in the open air. The temperature of 5 centimeters was 0.5 to 1 degrees higher than that of the open field. It could effectively prevent frost. The rain proof net can reduce the precipitation in the net room, and reduce the evaporation in the net room on sunny days.

4. strong light: strong light intensity in summer, strong light will inhibit the vegetative growth of vegetable crops, especially leafy vegetables, and insect resistant net can play a certain light shading and anti light direct effect. The general shading rate of the 20-22 mesh silver grey pest control net is 20 - 25%